Measurements and Results
R&S
®
FSVA3000/ R&S
®
FSV3000
162
User Manual 1178.8520.02 ─ 01
Fast ACLR
If activated, instead of using the IBW method, the R&S
FSV/A sets the center fre-
quency to the different channel center frequencies consecutively and measures the
power with the selected measurement time (= sweep time/number of channels).
Remote command:
Selected Trace
The CP/ACLR measurement can be performed on any active trace.
Remote command:
Absolute and Relative Values (ACLR Mode)
The powers of the adjacent channels are output in dBm or dBm/Hz (absolute values),
or in dBc, relative to the specified reference Tx channel.
"Abs"
The absolute power in the adjacent channels is displayed in the unit
of the y-axis, e.g. in dBm, dBµV.
"Rel"
The level of the adjacent channels is displayed relative to the level of
the transmission channel in dBc.
Remote command:
Channel power level and density ( Power Unit )
By default, the channel power is displayed in absolute values. If "/Hz" is activated, the
channel power density is displayed instead. Thus, the absolute unit of the channel
power is switched from dBm to dBm/Hz.
Note:
The channel power density in dBm/Hz corresponds to the power inside a band-
width of 1 Hz and is calculated as follows:
"channel power density = channel power – log
10
(channel bandwidth)"
Thus you can measure the signal/noise power density, for example, or use the addi-
tional functions
Absolute and Relative Values (ACLR Mode)
obtain the signal to noise ratio.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:POWer<sb>:RESult:PHZ
Power Mode
The measured power values can be displayed directly for each trace ( "Clear/ Write" ),
or only the maximum values over a series of measurements can be displayed ( "Max
Hold" ). In the latter case, the power values are calculated from the current trace and
compared with the previous power value using a maximum algorithm. The higher value
is retained. If "Max Hold" mode is activated, "Pwr Max" is indicated in the table header.
Note that the
trace
mode remains unaffected by this setting.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:POWer<sb>:MODE
Channel Power and Adjacent-Channel Power (ACLR) Measurement
